package com.mattrixwv.raidbuilder.service;


import java.io.File;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import java.util.UUID;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.multipart.MultipartFile;

import com.mattrixwv.raidbuilder.entity.Game;
import com.mattrixwv.raidbuilder.repository.game.GameRepository;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;


@Slf4j
@Service
@Transactional(rollbackFor = Exception.class)
@RequiredArgsConstructor
public class GameService{
	private final GameRepository gameRepository;
	//Related Services
	private final GameCalendarEventService gameCalendarEventService;
	private final GameClassService gameClassService;
	private final GamePermissionService gamePermissionService;
	private final RaidGroupService raidGroupService;
	//Values
	@Value("${uploadFileDirectory}")
	private String uploadFileDirectory;


	//Write
	public Game createGame(Game game, MultipartFile file){
		if(file != null){
			String fileName = UUID.randomUUID().toString() + "--" + file.getOriginalFilename();
			Path filePath = Paths.get(uploadFileDirectory + "/gameIcons").resolve(fileName);
			try{
				file.transferTo(filePath);
				game.setGameIcon(fileName);
			}
			catch(Exception error){
				log.error("Error uploading file: " + error.getMessage(), error);
				throw new RuntimeException("Error uploading file: " + error.getMessage(), error);
			}
		}
		return gameRepository.save(game);
	}

	public Game updateGame(Game game, MultipartFile file){
		Game existingGame = gameRepository.findById(game.getGameId()).orElse(null);

		//Delete the old file if one exists
		if((existingGame != null) && (existingGame.getGameIcon() != null) && (game.getGameIcon() == null)){
			log.debug("Deleting old file: {}", existingGame.getGameIcon());
			File existingFile = new File(uploadFileDirectory + "/gameIcons/" + existingGame.getGameIcon());
			if(existingFile.exists()){
				existingFile.delete();
			}
		}

		if(file != null){
			//Upload the new file
			String fileName = UUID.randomUUID().toString() + "--" + file.getOriginalFilename();
			Path filePath = Paths.get(uploadFileDirectory + "/gameIcons").resolve(fileName);
			try{
				file.transferTo(filePath);
				game.setGameIcon(fileName);
			}
			catch(Exception error){
				log.error("Error uploading file: " + error.getMessage(), error);
				throw new RuntimeException("Error uploading file: " + error.getMessage(), error);
			}
		}

		return gameRepository.save(game);
	}

	public void deleteById(UUID gameId){
		Game game = gameRepository.findById(gameId).orElse(null);
		if(game != null){
			if(game.getGameIcon() != null){
				File existingFile = new File(uploadFileDirectory + "/gameIcons/" + game.getGameIcon());
				if(existingFile.exists()){
					existingFile.delete();
				}
			}

			gameCalendarEventService.deleteByGameId(gameId);
			gameClassService.deleteByGameId(gameId);
			gamePermissionService.deleteByGameId(gameId);
			raidGroupService.deleteByGameId(gameId);
			gameRepository.flush();

			gameRepository.deleteById(gameId);
		}
	}


	//Read
	public Game getGameById(UUID gameId){
		return gameRepository.findById(gameId).orElse(null);
	}

	public List<Game> getGames(int page, int pageSize){
		return gameRepository.findAll(PageRequest.of(page, pageSize, Sort.by("gameName").ascending())).getContent();
	}

	public List<Game> getGames(int page, int pageSize, String searchTerm){
		return gameRepository.findAllByGameNameContainingIgnoreCase(
			searchTerm,
			PageRequest.of(page, pageSize, Sort.by("gameName").ascending())
		);
	}

	public long getGamesCount(){
		return gameRepository.count();
	}

	public long getGamesCount(String searchTerm){
		return gameRepository.countAllByGameNameContainingIgnoreCase(searchTerm);
	}
}